/Engine/Plugins/Compositing/Composure/Source/ComposureLayersEditor/Public/ICompElementManager.h
Determines if the specified element is being rendered by the hidden compositing viewport.
True if the game-thread is in the middle of queuing the specified element.
bool IsDrawing ( [ACompositingElement](API\Plugins\Composure\ACompositingElement) * CompElement ) const